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(in-package #:cmamut)
; TODO: Use c2ffi to extract the spec.json using the header file as parameter
(defparameter +target-package+ (gensym))
(defun get-raw-spec (filename)
(json:from-file filename))
(defun cook-type (raw-type type-associations)
(let ((tag (gethash "tag" raw-type)))
(cond ((string= tag ":void")
'sb-alien:void)
((string= tag ":function-pointer")
(list 'sb-alien:* t))
((string= tag ":pointer")
(let ((pointed-type (gethash "type" raw-type)))
(cond ((string= (gethash "tag" pointed-type) ":char")
'sb-alien:c-string)
((string= (gethash "tag" pointed-type) ":void")
(list 'sb-alien:* t))
(t (list 'sb-alien:* (cook-type pointed-type type-associations))))))
((string= tag ":float")
'sb-alien:float)
((or (string= tag ":double") (string= tag ":long-double"))
'sb-alien:double)
((string= tag ":unsigned-char")
'sb-alien:unsigned-char)
((string= tag ":unsigned-short")
'sb-alien:unsigned-short)
((string= tag ":unsigned-int")
'sb-alien:unsigned-int)
((string= tag ":unsigned-long")
'sb-alien:unsigned-long)
((string= tag ":unsigned-long-long")
'sb-alien:unsigned-long-long)
((or (string= tag ":char") (string= tag ":signed-char"))
'sb-alien:char)
((or (string= tag ":short") (string= tag ":signed-short"))
'sb-alien:short)
((or (string= tag ":int") (string= tag ":signed-int") (char= (char tag 0) #\<))
'sb-alien:int)
((or (string= tag ":long") (string= tag ":signed-long"))
'sb-alien:long)
((or (string= tag ":long-long") (string= tag ":signed-long-long"))
'sb-alien:long-long)
((string= tag ":array")
(list 'sb-alien:array
(cook-type (gethash "type" raw-type) type-associations)
(gethash "size" raw-type)))
((string= tag ":struct")
(list 'sb-alien:struct (intern (gethash "name" raw-type) +target-package+)))
((string= tag ":union")
(list 'sb-alien:union (intern (gethash "name" raw-type) +target-package+)))
((string= tag ":enum")
(list 'sb-alien:enum (gethash "name" raw-type)))
((or (string= tag "struct") (string= tag "union"))
(cook-composite raw-type type-associations))
((string= tag "__builtin_va_list")
(list 'sb-alien:* t))
(t (let ((new-type (gethash tag type-associations)))
(if new-type
(cook-type new-type type-associations)
(error "Unknown type: ~a" tag)))))))
(defun cook-function (raw-function type-associations)
(let ((raw-params (gethash "parameters" raw-function))
(cooked-params (queue:new)))
(dotimes (j (length raw-params))
(queue:add cooked-params
(list (if (string= (gethash "name" (aref raw-params j)) "")
(gensym)
(intern (gethash "name" (aref raw-params j)) +target-package+))
(cook-type (gethash "type" (aref raw-params j)) type-associations))))
`(sb-alien:define-alien-routine
,(let ((function-name (gethash "name" raw-function)))
(list function-name (intern function-name +target-package+)))
,(cook-type (gethash "return-type" raw-function) type-associations)
,@(queue:to-list cooked-params))))
(defun cook-composite (raw-composite type-associations)
(let ((raw-fields (gethash "fields" raw-composite))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (gethash "name" (aref raw-fields j)) +target-package+)
(cook-type (gethash "type" (aref raw-fields j)) type-associations))))
`(,(intern (string-upcase (gethash "tag" raw-composite)) 'sb-alien)
,(when (> (length (gethash "name" raw-composite)) 0)
(intern (gethash "name" raw-composite) +target-package+))
,@(queue:to-list cooked-fields))))
(defun cook-const (raw-const)
`(defparameter
,(intern (gethash "name" raw-const) +target-package+)
,(gethash "value" raw-const)))
(defun cook-enum (raw-enum enum-references)
(let ((name (gethash (gethash "id" raw-enum) enum-references))
(raw-fields (gethash "fields" raw-enum))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (gethash "name" (aref raw-fields j)) +target-package+)
(gethash "value" (aref raw-fields j)))))
`(sb-alien:define-alien-type
nil
(sb-alien:enum
,name
,@(queue:to-list cooked-fields)))))
(defun generate-enum-references (raw-typedefs)
(let ((enum-references (make-hash-table :test #'equal :size 256)))
(dolist (i raw-typedefs)
(let ((base-type (gethash "type" i)))
(when (string= (gethash "tag" base-type) ":enum")
(setf (gethash (gethash "id" base-type) enum-references)
(gethash "name" i)))))
enum-references))
; Typedefs get "flattened" so that resolving is just a lookup.
(defun generate-type-associations (raw-typedefs)
(let ((type-associations (make-hash-table :test #'equal :size 256)))
(dolist (i raw-typedefs)
(when (string= (gethash "tag" (gethash "type" i)) ":enum")
(setf (gethash "name" (gethash "type" i)) (gethash "name" i)))
(setf (gethash (gethash "name" i) type-associations) (gethash "type" i)))
(labels ((flatten-typedef
(k v)
(let ((new-v (gethash (gethash "tag" v) type-associations)))
(when new-v
(setf (gethash k type-associations) new-v)
(flatten-typedef k new-v)))))
(maphash #'flatten-typedef type-associations))
type-associations))
(defstruct spec
consts
functions
typedefs
composite
enums)
; This is done so we can separate definition types into stages when generating code.
; Some crazy shit is happening when processing typedefs so we can identify nested composite types and put them into the right buckets.
; What's left on the typedefs are references to said composite types.
; This allows for a comfier type resolution stage by letting us flatten typedefs.
; Composite types cause problems because they can't be redefined.
(defun classify-definitions (raw-spec)
(let ((spec (make-spec)))
(dotimes (i (length raw-spec))
(classify-definition (aref raw-spec i) spec))
spec))
(defun classify-definition (def spec)
(let ((tag (gethash "tag" def)))
(cond ((string= tag "function")
(push def (spec-functions spec)))
((and (string= tag "const") (gethash "value" def))
(push def (spec-consts spec)))
((or (string= tag "typedef")
(string= tag ":array")
(string= tag ":pointer"))
(let* ((internal-type (gethash "type" def))
(internal-tag (gethash "tag" internal-type)))
(cond ((or (string= internal-tag "struct")
(string= internal-tag "union"))
(when (string= (gethash "name" internal-type) "")
(setf (gethash "name" internal-type) (gethash "name" def)))
(push internal-type (spec-composite spec))
(setf (gethash "type" def)
(json:obj ("tag" (gethash "tag" internal-type))
("name" (gethash "name" internal-type)))))
((or (string= internal-tag ":array")
(string= internal-tag ":pointer"))
(classify-definition internal-type spec)))
(when (string= tag "typedef")
(push def (spec-typedefs spec)))))
((string= tag "enum")
(push def (spec-enums spec)))
((or (string= tag "struct") (string= tag "union"))
(push def (spec-composite spec)))))
spec)
(defun gather-composite-dependencies (composite)
(let ((names (make-hash-table)))
(labels ((get-deps
(def)
(dolist (param (cddr def))
(let ((param-type (cadr param)))
(when (listp param-type)
(cond ((or (eql (car param-type) 'sb-alien:struct)
(eql (car param-type) 'sb-alien:union))
(setf (gethash (cadr param-type) names) t)
(get-deps param-type))
((and (eql (car param-type) 'sb-alien:array)
(listp (cadr param-type)))
(setf (gethash (caadr param-type) names) t)
(get-deps (cadr param-type)))))))))
(get-deps composite))
names))
(defun sort-composites-by-deps (composites)
(let ((comps-and-deps (mapcar (lambda (x)
(cons x (gather-composite-dependencies x)))
composites))
(result nil))
(labels ((filter-deps
(cnd)
(let ((new-cnd (remove-if (lambda (x) (= (hash-table-count (cdr x)) 0)) cnd)))
(if (= (length new-cnd) (length cnd))
result
(progn
(dolist (i cnd)
(when (= (hash-table-count (cdr i)) 0)
(push (car i) result)
(dolist (j new-cnd)
(remhash (second (car i)) (cdr j)))))
(filter-deps new-cnd))))))
(filter-deps comps-and-deps))
(reverse result)))
(defun codegen (spec function-filter)
(let ((enum-references (generate-enum-references (spec-typedefs spec)))
(type-associations (generate-type-associations (spec-typedefs spec))))
(let ((consts (mapcar #'cook-const (spec-consts spec)))
(enums (mapcar (lambda (x) (cook-enum x enum-references))
(spec-enums spec)))
(composite (mapcar (lambda (x) `(sb-alien:define-alien-type nil ,x))
(sort-composites-by-deps
(mapcar (lambda (x) (cook-composite x type-associations))
(spec-composite spec)))))
(functions (mapcar (lambda (x) (cook-function x type-associations))
(if function-filter
(remove-if-not function-filter (spec-functions spec))
(spec-functions spec)))))
(remove-duplicates (concatenate 'list consts enums composite functions) :test #'equal))))
(defun to-file (code filename)
(with-open-file (f filename
:direction :output
:if-exists :supersede
:if-does-not-exist :create)
(let ((*print-length* nil)
(*print-level* nil)
(*print-pretty* nil)
(*package* (find-package +target-package+)))
(format f "~{~s~&~}" code))))
(defun run (input output &optional function-filter)
(when (not (find-package +target-package+))
(make-package +target-package+))
(let* ((raw-spec (get-raw-spec input))
(spec (classify-definitions raw-spec))
(code (codegen spec function-filter)))
(to-file code output))
(delete-package (find-package +target-package+)))
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